Tail (redirected from tails)

tail

Extension of the vertebral column beyond the trunk, or any slender projection resembling such a structure. In fishes and other animals living completely or partly in water, it is very important to movement through water. Many tree-dwelling animals (e.g., squirrels) use the tail for balance and as a rudder when leaping; in some (e.g., certain monkeys), it is adapted for grasping. Birds' tail feathers aid in flight maneuverability. Other animals use their tails for defense (e.g., porcupines), social signals (e.g., dogs and cats), warning signals (e.g., deer and rattlesnakes), and hunting (e.g., alligators).

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tail¹

1. the region of the vertebrate body that is posterior to or above the anus and contains an elongation of the vertebral column, esp forming a flexible movable appendage

2. the rear part of an aircraft including the fin, tail plane, and control surfaces; empennage

3. Astronomy the luminous stream of gas and dust particles, up to 200 million kilometres long, driven from the head of a comet, when close to the sun, under the effect of the solar wind and light pressure

4. Angling the lowest fly on a wet-fly cast

5. a final short line in a stanza

6. the lower end of a pool or part of a stream

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tail² Property law

1. the limitation of an estate or interest to a person and the heirs of his body

2. (of an estate or interest) limited in this way

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tail [tāl]

(aerospace engineering)

The rear part of a body, as of an aircraft or a rocket.

The tail surfaces of an aircraft or a rocket.

(astronomy)

The part of a comet that extends from the coma in a direction opposite to the sun; it consists of dust and gas that have been blown away from the coma by the solar wind and the sun's radiation pressure.

(electronics)

A small pulse that follows the main pulse of a radar set and rises in the same direction.

The trailing edge of a pulse.

(mathematics)

For a stochastic process represented byx(t₁),x(t₂),…, the process obtained by deleting the firstnterms, for somen.

(vertebrate zoology)

The usually slender appendage that arises immediately above the anus in many vertebrates and contains the caudal vertebrae.

The uropygium, and its feathers, of a bird.

The caudal fin of a fish or aquatic mammal.

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tail

1. Exposed lower portion of a slate shingle.

2. Tailing.

3.See rafter tail.

4.See lookout.

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Tail 

a more or less isolated and mobile posterior section of the body in vertebrates that performs various functions.

In fishes the tail section is not sharply differentiated from the body and is usually equipped with a large fin—the main organ of locomotion. The tail of terrestrial vertebrates does not perform a locomotive function, although in many animals, for example, caudate amphibians and reptiles, it serves as an auxiliary organ of locomotion. In extant birds the caudal section proper of the spine is shortened; in Carinatae it is represented by five to seven vertebrae that are concresced into the coccyx, or pygostyle, which supports the rectrices. The tail of mammals is a slender, mobile appendage of varying length; the skeletal axis consists of three to 49 free vertebrae.

The tail may be prehensile, serving as an aid in climbing (opossums, certain anteaters and monkeys, raccoons). It may serve as an organ of support and a rudder in some jumping animals (kangaroos, jerboas, great jerboas), or it may act as a parachute (squirrels, dormouses). The short tail of whales and sirens has developed a fin and, thus, performs a locomotive function. Some animals, for example, horses and cattle, drive away flying insects with their tails. In a number of mammals the tail is reduced.

In the human embryo a tail appears at the end of the first month or the beginning of the second. With normal development it disappears during the third month. The presence of a tail in a human in the postembryonic period is an example of atavism.